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Find the Temperature of the Refrigerant

A closed vessel with a volume of 2 ft^3 contains 5 lb of Refrigerant 134a. A pressure sensor in the tank wall reads 71.39 lbf/in.^2 (gage). If the atmospheric pressure is 14.4 lbf/in.^2 how do I find the temperature of the refrigerant, in deg F?

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Absolute pressure P = 71.39+14.4 = 85.79 lbf/in^2 = 12353.76 lbf/ft^2
V = 2 ...

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